Is ENA the same as ANA?

I'm just curious, could you please clarify something for me? I've been hearing about ENA and ANA, and I'm wondering if they're actually the same thing? Or are they two completely different entities? If they're different, what are the key distinctions between them? And if they're similar, in what ways are they alike? I'm really trying to get a grasp of this concept, so your explanation would be greatly appreciated. Thank you for your time and assistance!